Field discrimination circuit

Details Field discrimination circuit Field discrimination circuit

1989-10-23

1991-04-30

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, H04N 504

Patent

active

050123394

ABSTRACT:
A field discrimination circuit for use in a television receiver, which includes a shift register for shifting an input vertical synchronizing signal so as to produce n (n.gtoreq.6) pseudo vertical synchronizing signals having the same phase difference, a selector for selecting one of the n pseudo vertical synchronizing signals and delivering the selectd pseudo vertical synchronizing signal as a reference vertical synchronizing signal, a latch circuit for detecting input timing of the reference vertical synchronizing signal into one of n time sections obtained by dividing one horizontal scanning period by n, to thereby generate a latch output signal, and a decoder for effecting field discrimination on the basis of the latch output signal and generating a field discrimination signal.

REFERENCES:
patent: 4694348 (1987-09-01), Kamiya et al.
patent: 4701799 (1987-10-01), Yoshimura
patent: 4792853 (1988-12-01), Yamagishi et al.
patent: 4792857 (1988-12-01), Akiyama

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